Not sure what you revealed when studying the mechanism but there is no reason why it is not effective long-term. You would be surprised how many people do very well on the same dose for years at a time. Klonopin is nice because you can dose once a day with great coverage, it is sedating enough to assist with sleep (most anxious patients have insomnia) and has the lowest abuse potential because of its half life and its modest lipid solubility compared to most others-does not hit the brain very fast at all so no high.
While some forsure build tolerance but it is often people who overtake it or take it for the wrong reason. The most common use for myself is for the first few months in anxiety disorders while I am titrating up the SSRI as people with anxiety have a tough time tolerating SSRI's at the doses they need. Also a great augmentation for bipolar folks to keep them from ever having insomnia.
Its my favorite benzo by far.